022-00028AE Operation and Maintenance Manual Troubleshooting 6-5
Oil temperature too high. Debris in exterior of cooler. Clean exterior of cooler.
Oil cooler faulty. Contact your Daewoo
dealer.
Fan belt loose. Tighten fan belting as
required.
Actuators on one side of boom
have little power or do not
operate.
Overload relief valve is not operating
properly.
Repair valve or replace.
Damaged hydraulic hose. Replace hose.
Loose hydraulic fittings. Tighten fittings.
Internal damage to control valve
housing.
Replace control valve.
Control valve spool damaged. Replace control valve.
Sediment inside control valve. Clean and repair valve.
Check valve internal leakage. Repair or replace valve.
Damaged cylinder or pump. Repair or replace pump or
cylinder.
Cylinder internal leakage. Repair or replace cylinder.
Damaged cylinder rod. Replace rod.
Pilot valve failure. Replace pilot valve.
Problem Cause Remedy
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